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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a08485e4bb820d108f1b5a95b4c55143dda5e320f60a041cfb105c6052ee93' 
  AND token = 'qhQMx/tFOBmR5QSvr6fnJFU1i1na3zCe6+bjgDSwdMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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