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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563d9e08400a4992f2849e3e18a41236568064c3bf6c8ff44e454bebc1c1a513' 
  AND token = '1IKzaUuFJVOpa/6R09rzlDY+IZeOY8YqhhkThCUi28E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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