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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb4d6e9b7cee3fd8b03109014a73ab88cbf4810ecbc255d2dc5ccd329b09df0' 
  AND token = 'c2T6b+sdcNQ4RLcHb2HV1WcGdMF9ZhWjCTlZCl0iA58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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