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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5ee88be4699d328f36af1995b1115917a6c7eccdf77ff742a51e1a16789af6' 
  AND token = '9YKPBySH6HHjSo2N8cXUJwJmbw8hMvYGe0i4LZtkPw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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