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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe5f5c6c2c0b144957f3a21e93b6270b5fea7a984946134c5a11cc87c160ba7' 
  AND token = 'pCbSQnfcDetb9YAdfMP/5AiOvSpc7FB9zYD5xWYJOfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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