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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548031d8d531bd442e6f6a8bcaa8a6c0f137baa07204351a0b84649f1f6003b7' 
  AND token = 'i8kqyiyxGf6c5yDn23TZ8b9DPqsDzO5VoQe73c4B8Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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