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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15c2c99318da38769b6e81f924fe8fd4a510de71175572866fa581146bb5d92' 
  AND token = 'jB7lmDD5OuIIPtnUb3AK123POcUN+suabKk2xBcz/pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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