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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a042d3b4f5205f86ae1f547dcc9164d94026da23cae2af24eba6094363f060f6' 
  AND token = 'yucf4hXlOqjMtPW2nk+kptHjf4YV7GAkuPDij6Ot1aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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