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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d4a2395692d040bfdef965334adb5fb7f5b40bc7dbbc753e4ed8533fc34942' 
  AND token = 'h+lBBI8dACi64w7ud4zpCx2cWyOzJ4uMF686DdF5bXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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