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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d5988cbfcc9cf1d5e9b5715d72856b1b78f1e0fe42821159427fa02f0488f4' 
  AND token = 'SdrJY7Cos4ZjeC3AAOudjh2XGySqbSFkRP2kBR5OS7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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