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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63fa74b381b986fcd5020700eb990f751d71466bc6d558a726095cd3518bc55' 
  AND token = 'n5drGM1ps+GxlLp9Apwx2hLcvOMv6lg++YY11znR6fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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