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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add5614bcbc9421e892eab2f8df067b6675e94316ca12b050809367213313891' 
  AND token = 'd3Z9pddVDIB287Idx7NlsdzrMd+6SyFzfYkHhIGCPSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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