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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578185dbda71363f63cce98c4bca579f5a5fd59e816e13b6a504764a693ad9a9' 
  AND token = 'De7/25/98AfKjwjp97vfV3Hxlazt/Q726yYKzWUuGlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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