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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33ae8b49ad73867aa3763400c76c6fceaf5332ceb4a1cafa1ceba8f70ecfe12' 
  AND token = 'n5FKO/CloRF3So32tZId/TfM6qJR7fP2sGAGki+ARGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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