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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991bbc463312c4a1496aa557e92d83c833a9d2039d938019f82a5157ec08c124' 
  AND token = 'zvLThjX2M8hjkaA6jmYYd1LnvAYMjw6bUjKYTRlQaWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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