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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c9a018d7629c8d0d0db5491067b3c64186c1eba3eaa9c0aa37bd755cd4752c' 
  AND token = 'fSvHwCQ2uVAux7Wa/T1AxnOK8eJ7eGr4VZtAC3vlUhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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