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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6dc8679204a8d3e8c56fda81c385ed2e917a585cdc93cf09dd081f102be7051' 
  AND token = 'rgPh70QGKdSX55bHZ17lgiWc9dI6naPs68tJ6Q7aLdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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