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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88f5656ea804299c85dceb19e622f164d7db650300066c34efd462abfd7776a' 
  AND token = 'yyY4ZAye2nI1mSIp1a5Lcazsf6RjgzW41I5Ib2WT5J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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