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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7db3696a24b9b66307cedb93e2c34f5e3b4cd5011d1193f7b4265292a009230' 
  AND token = 'IJYM5gZoiyOsLe5klK5OQr7GnjA65qnosexGSu3Byf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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