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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df86670edc746ace18b0fac5d1afb6df0dff9a0433f80efcadee18000a74fb2e' 
  AND token = 'tWcbfQb47D9sLi6AwLPAxTzlFZAx4q8a8QURixyrukY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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