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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa36bcf6576f94690ea9e20c780cb9291cf6fe532cbc47df6d0aed220254d348' 
  AND token = 'ae/Y2OW/FOS0pprpea5XwVEPRlAKgwt/lAZc7ouB05s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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