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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a83418bb6fc8ac2408d1d4afd76e4179e19a037db407da6e8a0ae51ddea9e30' 
  AND token = 'rQx3LQ4DTFsSv8WhG7s7d9Q9ed3mDvYk3ltVwQXyCko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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