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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1cb39a5ccb1b0f1315e236bbcbaa24ab57c520d18c8fb0650d563e60a04c79' 
  AND token = 'b5oO67c9XOeQlxHQzC02R7V0M4DO1kA5lOIOB4FJBEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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