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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71afc4f4ac6bad52f70f72ecd9f6eec6fbbec4d56190846634ed6405c19b605d' 
  AND token = 'skrrapt7QK5Z8Ha4Q4TK1HdWa+uMPtlCDkH3TtFHSxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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