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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0dd93e93b3e07204a4512580645895b6b17961228a97e1b41e5a8b89582918f' 
  AND token = '6Jbkgj+SzDWZBBgQTP96/DkrGnLdobE6AxU6edrPRrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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