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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc9d528228e150649f8c8014fcfa4ec2a2f4fa0891fc1b7ef1484705afc87f4' 
  AND token = 'lC4NO9kc6byQKYREU3TkS+4ha425XIpE/Ym/hAVMrVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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