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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425c30416c5b344ea95f8b54320dd375ced902b859a01be0f16cb20083be46db' 
  AND token = '8wtmgmWnbt5A94VzX5C2xrbmD8G+5B4MpfUydLxO+6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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