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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2422061a70fec32c031704c474374403eb30454266535ea4cf66e98466553f5' 
  AND token = 's38peSnOvg7q5oTbL+U2nZlh/ugZToFMsJ7Esww4Ef0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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