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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f23dc42001370d74c81b5beb68308f66ef64b1a10aa378a62f4546fdcdc57a' 
  AND token = 'XrIkkTYY15A881XNlE1YN34lq4U2wQy7aIu7PRUll8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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