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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd173b208faaef024f55fc3a96cea15b5117daae4a1e1272e06f3775a9b0a257e' 
  AND token = 'GJjcD3hfzs6xmIQgCWS6k1m1BpUYMSaJoB4OwH6bX5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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