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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c203743a77ae0b399fd5801777b83fe4a9505db88dfe3a50398678bb7a9f9e23' 
  AND token = 'zfnCKHplXnz3alz6yqmjD1m1ZmQWoEn9dQ6EXqNfI9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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