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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6fdc90b9b2a5afadb3342199101b9157660d421afef388139852e8dfb341f98' 
  AND token = 'FArSC3086MYS+J5QsgpmaCH2b5HPw5uUj4Hmwx5q3gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}