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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf4aa843fa9ae24d486a5bb49e706f8faf186ed73a6dc7515ca9caec2047153' 
  AND token = '/3SJ+N0PWlgIWQME8c37TjT4Cturr0X73EYdtVhBPSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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