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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da68cf2fca4b018d7db8058166ec7452e2d5fd23001fb0c065fbf8c19b698137' 
  AND token = 'Ho7S/QTYp35Mnoi6LbpgrZ7PJaXUvYjXcOEI2D6/0Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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