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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1690785b30f9e8d1142f50e94e7843c67a8fcd35faed76df6db109fb680e16ba' 
  AND token = 'F3QcAoxkQivJr6XuivObqfhiZFug2pojJ61shXv7MIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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