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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acb199241f9f0da96b79e7dd69fcebfb2ffdf3b0c0b1e938c6f2732e98a2b75' 
  AND token = 'LLXm2syWPXKPB6jiBqWi6EVoh+t5h6ON3KZ7K4ijwLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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