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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241b349ba8a7eabe63737edbf57142e0bb83040bb68737b2703221f103025a44' 
  AND token = 'np+qHJXSOBheChGSA/jDEjyM9FHLAS42I66I7KJg5lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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