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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35f5d12244ae0c0bb2ad16cea84b38aa6e874fa43b11fb56c8e6d619fb13713' 
  AND token = 'V9RUmIjsFUiCz677xqaJo3XfQLmSxJ6dst3PRvbCSuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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