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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8c6d4c002e0dc1dad3c1eb213a2e0031a282388d851d1597c352fdb5375ad1' 
  AND token = 'xFFQL9I9Bl0m0KRAilRW8S0QGG68oknI7nRMON7HA6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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