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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7519bbd5855f5920fb9355eff792c282d3d43cefb9d1467de98b4e48141b0129' 
  AND token = '5kI0I1gkTQbP2jOtkrbIQs26e/fvA1cKtb5mR4/8cFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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