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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b94c7ca3f52acdda7ea5a5db2d65b4e12a5459bfb16bf7e2f0d84062c002e1c' 
  AND token = 'hyzHgKH2RdFIUgLrIeM1WmKWbN0dt+67vF4yE4AfrIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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