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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bca7d2c4d71543e1c425f57b931e307bab0f1b7c51d2e75cd9f9d46057eeb5a' 
  AND token = '0gDWT3AHXonnVvK+CScEwCKSf3ywGJJPtANjyvTfPjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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