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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c5fc1dcec96dbde81097c80fe407f13d29e2b44d691c078dd979969f3938a1' 
  AND token = 'lftNpQ6x665HknSf1C4EoVQMOIb7u2rdJCw/Bnhvl5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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