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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd856bc6f6620a36a33823645e0eeb799a3f233c501475a47d7fb577fdc9b11b8' 
  AND token = '1S2gyOe44SVt8EpgqWIp0w9/LZe7+Srow/weErCurw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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