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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773fe98773dcb011aed38e8193d7d9e355bd24d98296b3842f126dd9e9f15592' 
  AND token = '1mfM/88DZOdwn35YNPJ6215RK1lVpQGkFuKHrstJviY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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