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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2f552ef5fe6e0828c6250373c2de9787f4d2be61f100af0ffcb397e795755c' 
  AND token = 'ArcgrUkdgjwQQgK0eHlv1banh5KP9AjxSPl4QOB21FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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