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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52499455f7e4aa11eb21ef9233cc0f321c0665f83feb741a7b6a8c635aae9a55' 
  AND token = 'iRjZM13xOW8c9lh2qwgUp7N17IXREociS/4RprR7/sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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