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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1cb47dc83a3c4aebe3db2600c4a123b78fcb3a34e3877e32dcb4f0107610ee' 
  AND token = 'cOnPP3vefP/w5rWxFZ55X8GkfxarnwIO9FMGgc+mOpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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