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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da496aa8441430c3582465028aa210b708269e55c417e98c75f5c0f177275e7b' 
  AND token = 'wRImZjnSqfema7Sn8pAoczdmHEL3akJ6W8nSKazRHB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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