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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0d4b7642b46a47866482026a05a4bbbc971246b0bfe680e82d6ef9f77a7bbd' 
  AND token = 'Xm3sOUpiX2r1G2U+Y9FdErT8oAyfHkEM/jyOppUFtQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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