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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8a300c656d80f1f051fd7c42a2dbc67ca7c2e16e9ac4d86d49fe9e2eef42e4' 
  AND token = '6N3cBAXRCEWY2/OrXdpRCw1+lSrth/jMupDid2gpVH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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