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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee076cd316d62bfbde94685c232e5b5d9f410b91a50bc3dae9f9ae2ac2fa6f02' 
  AND token = 'DkzCFTQ7Mvth2U0qdmu+ZCZbF3czYkfypqu8U8UckKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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