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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ec8ad6fe4ffbe88c9e2b93f8066ac526df7246bbac94e7249f2ac6230ac231' 
  AND token = 'kZoiYSHub+/s4ErDboJxgmsGgP9ONmAR0Zc2ANaJkIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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