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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263418a2c5f920d697c492e1552802a8f550595e0bb709e6516df3cab9a9720c' 
  AND token = '+Dxy1TD5Qn2sWux0thm37umkmCaiIs3EIWU82QavbnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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